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Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Expenses Benefit Disclosure [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 34.00%    
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax $ 123,000 $ 1,083,000  
Tax Credit Carryforward Expiration Period expire between 2016 and 2025    
Cumulative Effect on Retained Earnings, Tax $ 6,300,000 6,300,000  
Unrecognized Tax Benefits, Income Tax Penalties Expense 292,000 46,000  
Unrecognized Tax Benefits, Beginning Balance 1,800,000 1,449,000 $ 926,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1,200,000 956,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 336,000 281,000  
Income Tax Examination, Penalties and Interest Expense, Total 55,000 89,000 $ 9,000
Reduction In Unrecognized Tax Benefits 316,000    
Unrecognized Tax Benefits Resulting Of Net Operating Loss Carryforward $ 12,600,000 $ 11,800,000